The founder of the Islamic State group news agency was reported killed with his daughter in an airstrike last week in eastern Syria, opposition activists said Thursday.

The militant group itself has not reported the death of the Aamaq agency founder, Baraa Kadek. Activists said Kadek was close to the ISIS leadership, gaining their trust and reportedly meeting with the enigmatic leader Abu Bakr al-Baghdadi.

Kadek’s brother, Hozaifa, and former friends reported his death, saying he died when a suspected airstrike by the U.S.-led international coalition fighting IS hit his home in the town of Mayadeen in Deir el-Zour province.

The brother posted the announcement on his Facebook page. A former colleague said Kadek and his daughter and wife were wounded in an airstrike last Friday and that he died of his wounds Wednesday.